Abstract: In some examples, a system is disclosed that includes a roller assembly for a printer. The roller assembly includes a pressure roller, a belt coupled, a drive assembly to rotate the pressure roller and to urge the pressure roller into the belt, a heater to apply heat to the belt, and a temperature sensor to detect a temperature of the belt. In addition, the roller assembly includes a controller to increase a pressure applied to the pressure roller from a first to a second pressure in pressure in response to a temperature of the belt being greater than or equal to a first temperature threshold. Also, the controller is to initiate an advance of a print media to contact the belt in response to the temperature of the belt being greater than or equal to a second, higher temperature threshold.

Abstract: Example implementations relate to media stacking mechanisms. In some examples, a printing device can include a stacking mechanism that includes a tamper to tamp print media positioned within the stacking mechanism, and a controller comprising instructions to: tamp a first sheet of print media received at the stacking mechanism a first distance based on a first size of the first sheet of print media, tamp a second sheet of print media received at the stacking mechanism a second distance based on the second size of the second sheet of print media, wherein the second sheet of print media is positioned over the first sheet of print media, and tamp a third sheet of print media received at the stacking mechanism the second distance when the third sheet of print media is the first size, wherein the third sheet of print media is positioned over the second sheet of print media.

Abstract: Examples of printing devices and print guides for accurate detection of a print start location are described herein. In some examples, a printing device may include a marker sensor to detect a print start marker on a print guide as the printing device moves on the print guide. The print start marker may be located on the print guide at a distance before a print start location. The print guide may have a reference marker located in relation to the print start location to provide an accurate indication of the print start location to a user. The print guide may be physically separate from a print media. In some examples, the printing device may also include a distance measurement sensor to measure distance traveled by the printing device after detecting the print start marker. The distance measurement sensor may trigger a start of printing at the print start location.

Abstract: Some examples include a print system including a memory to store instructions and print data of a print job, a processor to execute the instructions in the memory to reference print data of a print job, transform the print data into a plurality of print regions of a medium representation, each of the plurality of print regions including a print density, determine the quantity of print regions having a print density exceeding a predetermined threshold, and apply a modifier to the quantity of print regions having a print density exceeding the predetermined threshold to generate a score. The print system includes a print engine to move the medium along the print path to deposit a print substance onto a medium and apply drying to the medium and a controller to control a drying of the medium along the print path of the print engine in response to the score.

Abstract: A page of a print job is to be compiled by a printing device upon printing. It is determined that at time of compiling, the page will include print fluid, greater than a threshold, at locations corresponding to the compiling paddles. Drying of the page is responsively increased upon the device printing the page.

Abstract: Some examples include a print system including a memory to store instructions and print data of a print job, a processor to execute the instructions in the memory to reference print data of a print job, transform the print data into a plurality of print regions of a medium representation, each of the plurality of print regions including a print density, determine the quantity of print regions having a print density exceeding a predetermined threshold, and apply a modifier to the quantity of print regions having a print density exceeding the predetermined threshold to generate a score. The print system includes a print engine to move the medium along the print path to deposit a print substance onto a medium and apply drying to the medium and a controller to control a drying of the medium along the print path of the print engine in response to the score.

Abstract: Example implementations relate to media stacking mechanisms. In some examples, a printing device can include a stacking mechanism that includes a tamper to tamp print media positioned within the stacking mechanism, and a controller comprising instructions to: tamp a first sheet of print media received at the stacking mechanism a first distance based on a first size of the first sheet of print media, tamp a second sheet of print media received at the stacking mechanism a second distance based on the second size of the second sheet of print media, wherein the second sheet of print media is positioned over the first sheet of print media, and tamp a third sheet of print media received at the stacking mechanism the second distance when the third sheet of print media is the first size, wherein the third sheet of print media is positioned over the second sheet of print media.

Abstract: A page of a print job is to be compiled by a printing device upon printing. It is determined that at time of compiling, the page will include print fluid, greater than a threshold, at locations corresponding to the compiling paddles. Drying of the page is responsively increased upon the device printing the page.

Abstract: Some examples include a print system including a memory to store instructions and print data of a print job, a processor to execute the instructions in the memory to reference the print data of the print job, determine a process characteristic of a print job, the process characteristic including one of a plexity of the print job, a finishing of the print job, or a humidity of the print environment, and transform the process characteristic into a print process modifier. The print system including a print engine including a print path to move the medium along to deposit a print substance onto a medium based on the print data and apply drying to the medium, and a controller operably coupled to the processor and the print engine, the controller to adjust the drying of the medium along the print path of the print engine based on the print process modifier.

Abstract: In some examples, a system is disclosed that includes a roller assembly for a printer. The roller assembly includes a pressure roller, a belt coupled, a drive assembly to rotate the pressure roller and to urge the pressure roller into the belt, a heater to apply heat to the belt, and a temperature sensor to detect a temperature of the belt. In addition, the roller assembly includes a controller to increase a pressure applied to the pressure roller from a first to a second pressure in pressure in response to a temperature of the belt being greater than or equal to a first temperature threshold. Also, the controller is to initiate an advance of a print media to contact the belt in response to the temperature of the belt being greater than or equal to a second, higher temperature threshold.

Abstract: An example printing device may comprise a first bin to receive print media, where the first bin is a non-finishing bin, a second bin to receive print media, where the second bin is a finishing bin, a finishing device, and a controller to determine a total number of finishing device failures and redirect a print job from the second bin to the first bin in response to a determination that the total number of finishing device failures exceeds a threshold value.

Abstract: An example printing device may comprise a first bin to receive print media, where the first bin is a non-finishing bin, a second bin to receive print media, where the second bin is a finishing bin, a finishing device, and a controller to determine a total number of finishing device failures and redirect a print job from the second bin to the first bin in response to a determination that the total number of finishing device failures exceeds a threshold value.

Abstract: A drop detector includes a printed circuit board (PCB) including a number of optical channels each formed by a light emitter and a light detector and a number of holes defined in the PCB over which the optical channels pass over and through which a number of ejected drops from a number of printheads pass through wherein each of the number of holes defined in PCB are sized to contour the shape of the number of the printheads.

Abstract: A drop detector includes a printed circuit board (PCB) including a number of optical channels each formed by a light emitter and a light detector and a number of holes defined in the PCB over which the optical channels pass over and through which a number of ejected drops from a number of printheads pass through wherein each of the number of holes defined in PCB are sized to contour the shape of the number of the printheads.

Abstract: A method of detecting droplets of printing fluid output from a nozzle array includes, in an example, grouping a number of nozzles into a number of individual groups of nozzles and sequentially detecting, with a printing fluid detector, printing fluid ejected from each group of nozzles using a linear position encoder to synchronize the position of the printing fluid detector wherein the printing fluid detector stops moving while detecting each group of nozzles.