K40 (with wheels) Adjustable Bed

This remix is for a K40 with wheels. I changed the design, so that the threaded bar does not protrude from the bed and cutting area is not wasted.

The bottom holder contains a 8mm nut to hold the threaded rod and is screwed to the bottom with M4 screws. The timing pulley is fastened to the rod and with a ball bearing mounted to the top holder. The belt is tensioned fairly tight with cable ties.

I printed the parts with 25% infill and support.

From home depot:
- 15x15mm steel square tube (2x15cm and 2x28cm)
- expanded metal 50x25cm
- M8 threaded rod + nut

From Ali:
- 8x16x5mm ball bearing https://www.aliexpress.com/item/10PCS-LOT-Ball-Bearing-688-ZZ-688-2Z-688-2RS-688-2RZ-688-DDU-8x16x5-mm/32833410716.html
- Pulley https://www.aliexpress.com/item/Reprap-CNC-Idler-Pully-without-teeth-2GT-timing-pulley-with-ball-bearing-3D-printer-for-6mm/32805017992.html
- Timing pulley https://www.aliexpress.com/item/1-piece-20-teeth-Bore-8mm-GT2-Timing-Pulley-fit-width-6mm-of-2GT-timi