3D printer - Velleman K8200

Velleman K8200

The Velleman K8200 is an opensource RepRap printer, also sold under the 3Drag name. This printer is connected to a Raspberry Pi with OctoPrint installed. To use, plug the 3d printer and Raspberry Pi into the mains and switch on, after a minute or so the Raspberry Pi will launch the webbased OctoPi control software. Connect your computer to the Makerspace wifi and point your web browser at http://192.168.1.20.

Specification

Build volume:	200mm x 200mm x 200mm
Filament diameter:	1.75mm
Nozzle diameter:	0.4mm
Filament types	Most, but prefers PLA
Max hotend temperature:	275 deg. C
Max bed temperature:	80 deg. C
Hotend	Genuine E3D all metal hotend
Extruder	Genuine E3D Titan extruder

• Magic numbers for Layer heights, use these for best quality:

0.100 mm

0.150 mm

0.175 mm

0.200 mm

0.225 mm

0.250 mm

0.275 mm

0.300 mm

0.325 mm

The Firmware has recently (20/12/2018) been updated to Marlin 1.1.9 with thermal runaway protection enabled. Certain constraints have been limited in firmware

• Maximum hot end temperature is 275 deg.C
• Maximum bed temperature is 80 deg.C
• Thermal runaway is now enabled

Velleman K8200 web site

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Current Issues

• There is a small firmware issues at present, on large Z moves the firmware will halt and the printer control board will need resetting. During the print everything seems okay. Therefore before starting a print get the Z axis near home. If the board resets turn the printer off and on again (not OctoPrint) re-connect Octoprint and carry on. I will investigate and rectify soon (KE).
• I have made a couple of changes in firmware

1. Enable the 'noisy' endstop feature, this should prevent the error on Z homing.
2. Turned off thermal runaway on the bed heater (thermal runaway is still enabled on the hotend), this will prevent thermal runaway kicking in during a print.

I tested for several hours and did not run into any further firmware resets. Please let me know if you encounter any. KE.

Upgrade Plans

Todo

• Look at Z nut, currently has a lot of backlash Complete, but Z flexible coupler needs replacing, new one is on order
• Install new power supply - This is the next upgrade required, current power supply cannot keep the bed up to temperature - ordered.
• Install RAMPS control board
• Install new belts and tighten properly
• Consider installing second Z lead screw and motor
• Consider upgrading heated bed

Complete

• New Easy Peelsy magnetic bed surface has been installed. Please do not use scrapers on it. Clean with Isopropanol before using.
• Install new E3D hotend and direct drive Titan extruder for 1.75mm filament