This is a Z-Axis for OpenBuilds ACRO system. I designed it with a few key requirements in mind:
- has to be sturdy enough to able to carry a small drill. I drill small holes (2mm in diameter, 15 mm deep, plywood / MDF) with it. This was very important to me. This is why I tried to get the drill to be as close to the 20x40 bar as possible.
- simple tool changing. For example, I want to quickly go from using a drill to using a laser.
- should not deviate from original ACRO design too much
- most parts should be be 3D-printable or easily sourceable.
I am very happy with how it turned out and I hope you like it too.
I bought all of the hardware, except for M3 screws, M4 screws and coupler on openbuildsstore.com. It was about $80 + shipping.
Main Z-Axis Body:
- 2 x V-Slot® 20x20 Linear Rail, Length: 124mm
- 1 x 8mm Metric Acme Lead Screw, Length: around 140mm, depends on the motor
- 3 x Screws M3, Length: 35 - 40 mm. This one also depends on the motor
- 1 x 5mm to 8mm Flexible Coupling
- 4 x Aluminum Spacers, Size: 3mm
- 2 x Precision Shim - 10x5x1mm
- 8 x Low Profile Screws M5, Length: 35mm
- 4 x Low Profile Screws M5, Length: 10mm
- 12 x Tee Nuts - M5
- 4 x Self Tapping Screw
- 1 x Nut Block for 8mm Metric Acme Lead Screw
- 2 x Eccentric Spacer, Length: 6mm
- 2 x Aluminum Spacers, Size: 6mm
- 4 x Xtreme Mini V Wheel Kit
- 4 x Low Profile Screws M5, Length: 27mm
- 2 x Low Profile Screws M5, Length: 25mm
- 4 x Screws M4, Length: 12mm
The main part is hard to print because it tends to warp due to large surface area. I only printed it once and it was a little bit warped. I guess I would suggest using a brim.