Rolling Plotter using wider wheels and One Wheel motor

thingiverse

**UPDATE 3/29/2023** There are 3 Assembly videos for this machine now. Use Part 2 for a better version of assembling the Wheel Plates. Part 1 https://youtu.be/oh9MNZ965DE Part 2 https://youtu.be/JBshTn5b3Qc Part 3 https://youtu.be/cSlfY5XK-lM **UPDATE 3/18/2023** I added some images of exploded views of some subassemblies to clarify assembly. Make sure you go by the wheel plate assemblies when building this. **UPDATE 3/12/2023** I made 2 other versions of the files that have the bearings inserted in them for anyone that needs a tighter fit for the bearings. I would suggest printing: M8_BearingWheelMainAndBackPlate_22_2mmID.stl (tightest fit) M8_BearingWheelMainAndBackPlate_22_3mmID.stl (medium fit) M8_BearingWheelMainAndBackPlate_22_4mmID.stl (looser fit) before printing the wheels are other bearing related parts to see what size works best for you. **UPDATE 3/8/2023** I changed part of **BearingHolderAndSpacer_NearMotor_V7.1.stl** to allow for M5x15mm screws by recessing the the bearing holder 2mm. That still gives it 4mm of plastic where those screws connect. This part is now called 2060_BearingHolder_22_4mmID.stl, 2060_BearingHolder_22_3mmID.stl or 2060_BearingHolder_22_2mmID.stl This is a remix of my original Rolling Plotter design. The major change here is using a single motor for both sets of wheels & using wider wheels supported on both sides of the wheels. I will add more detail as time permits, but am uploading the STL files, assembly file & BOM in case someone wants to get started building this machine. Instead of using the 24 O-Rings required for the tires in this design, you can optionally use this tire and print in TPU. https://www.thingiverse.com/thing:5856600 The build log for this design goes back to 2020 & can be found here: https://openbuilds.com/builds/a-rolling-plotter.9207/ You can find some more discussion about it here: https://forum.v1e.com/t/rolling-plotter-build/15389 This newer design is closer to the end of these build logs. For the electronics, I am using a MKS Gen 1.4 for the controller board. The power is supplied from a portable P/S using this design. https://www.thingiverse.com/thing:4226726. The 2 limit switch boards for the X & Y axis. There is no Z-axis, but a servo that controls the Pen Up/Pen Down. I am using Klipper firmware with octoprint running on a raspberry pi. I started off using Marlin, but couldn't get the servo to work in sync with the X/Y movement. GRBL firmware compatible boards are also an option with this plotter. I have only setup configuration files for Klipper & Marlin. If you make your own Z-axis with stepper motors, Marlin will work. For powering the raspberry pi instead of plugging into wall, I am using a ravpower usb charger that seems sufficient for my raspberry Pi 3b+. Another controller board to consider if using Marlin or klipper is the BTT SKR 1.4 board. This board could give you sensorless homing with TMC2209 drivers. For the Z-axis with servo I am using this remix: https://www.thingiverse.com/thing:4276609 . There are also a couple of optional mounts with that design that use the 28BYJ-48 motor or a Nema17 pancake stepper motor. See that build for attaching that mount and additional parts you might need. I included the 1st version of the BOM. Let me know if I need to change anything there. I also included a STEP file of the assembly of the parts. Here is a video of the 1st test run of this machine. https://youtu.be/qG2k6QIU7kg Here are the Quantity and parts to print for my configuration. 2 - WheelPlateMain_M8_V23.stl 2 - WheelPlateBack_M8_V22.stl 4 - 80TDrive_6_ORings_Wheel_2Sides_22_4mmID.stl (22.3mm & 22.2mm version are tighter fit if they work better for you) (see assembly file for how the spacers, bearings go in) (I would also put the M8 locknut on the outside to make it easier to change tires.) 4 - Wheel_Spacer_17_5mmID_25_5mmHt.stl (22.7mm & 22.8mm are tighter fit they work better for you) 1 - Wheel_EndSpacers.stl (this is the spacers for all 4 wheels) 2 - BearingSpacer_7mm.stl 4 - M8_BearingWheelMainAndBackPlate.stl 2 - V2060x92mm.stl (optionally you can use 2 short V-Slot 2060 with corners) 2 - BearingHolderMountNearMotor.stl 2 - 2060_BearingHolder_22_4mmID.stl (22.3mm & 22.2mm version are tighter fit if they work better for you) 1 - WheelMotorMount_Flat (to mount wheel motor) 1 - Motor_IdlersMount.stl (to mount Carriage motor with idlers) 2 - Car_Idler_EndMount_V7 1 - Wheel_Axis_LS_Mount.stl 1 - Car_Axis_LS_Mount.stl 1 - CarriageAxis_Parts.stl (see https://www.thingiverse.com/thing:4276609 for other parts here) The 2 files **M8Rod_Gauge_12mm.stl** & **M8Rod_Gauge_25mm.stl** are used to set the spacing for M8 axle rod. With all the bearing spacers loose, place 2 of these between the two V-Slot 2040 extrusions from the top & the spacing should be correct.