Stage 04: Gantry

Build the X-Endstop assembly as shown:

X - Endstop

3D Printed X-Endstop Mount

M2.5 x 10mm Cap Head

M4 x 12mm Button Head

M4 T-Nut

Mount the assembly to the inside rear right corner of the frame.

It should be fixed approximately 20mm from the top extrusion.

Fix onto the four LDO motors the vibration dampeners.

M3 x 6mm Cap Head

Vibration Dampener

LDO NEMA 17 Motor

Heatsink

Mount the gantry motors as shown with M3 x 6mm Cap Head Bolts.

Prepare 4 rail mounts as shown by loosely fastening an M5 T-nut onto the M5 bolt.

M5 x 10mm Button Head

M5 T-nut

Fix the rail mount assemblies from the previous steps onto the two 410mm long MGN9H rails.

Fix onto the fourth hole form the edge.

M3 x 6mm Cap Head

Use the orange stoppers to prevent the carriage from falling off the rail.

Mount the rails onto the inside of the top of the frame as shown.

There should be equal distance between the edges of the rails and the frame - around 30mm.

Install the gantry onto the rail carriages.

M3 x 8mm Cap Head

Fasten all bolts loosely before tightening, this will make installing easier.

Set the orientation of the gantry to match that shown in the images.

When the gantry is slid all the way to the left it should bump the endstop as shown.

The rail carriage should be on the edge of the rail, but should not fall off.

Make adjustments to the rail and/or endstop mount accordingly if the above conditions are not met. Adjust the front rail also so it lines up with the rear rail.

Mount the final 350mm MGN9H gantry rail onto the gantry.

M3 x 8mm Cap Head Bolt

The rail should have its mounting holes start 15mm from both ends.

Mount the tool carriage onto the gantry rail.

M3 x 6mm Cap Head Bolt

Fix the Master Plate onto the Tool Carriage.

Master Plate

M2.5 x 35mm Cap Head

M2.5 x 30mm Spacer

Secure the Master Plate in place with two M3 x 6mm Cap Head Bolts.

Plug the USB cable into the top of the Eddy Bed Scanner Probe. The cable should route under the spacer.

Fix the Probe to the Master Plate with two M3 x 18mm Cap Head Bolts.

Assemble the Servo mechanism as shown.

Makertech Servo Motor

Servo Cam Shaft v2

M5 x 8 x 0.5mm Shim

Red Compression Spring

F605ZZ Bearing

Install the cam pin with the grub screw pressing onto the flat face of the cam pin.

Use the included bottle of thread locker to ensure the grub screw does not come loose.

Cam Pin

M3 x 4mm Grub Screw

Install the servo mechanism that you built in the previous step onto the Tool Carriage.

Feed it in from behind, ensuring the bearing sits inside the hole on the Master Plate.

M4 x 6mm Button Head Bolt

Fix the endstop to the Tool Carriage bracket as shown.

M2.5 x 14mm Cap Head Bolt

M2.5 x 4mm Spacer

Drop pulleys onto each of the four motors.

Orientate so that the pulley teeth are facing downwards.

Do not tighten yet.

Take the 4m roll of GT2 belt and cut it in half.

Take one end of each belt and feed it in through the slit on the back left side of the carriage bracket.

It needs to be fed in from the inside of the bracket - you might need to temporarily remove the bracket from the linear rail carriage to gain better access.

Ensure that the belts teeth are facing out.

Fix the belt in place with an M4 x 6mm button head bolt and M4 penny washer.

The top belt should follow this path around the idlers and motors.

Remember this is the top belt and should be wrapped around the top level idlers.

The bottom belt should follow this path around the idlers and motors.

Remember this is the bottom belt and should be wrapped around the bottom level idlers.

Adjust these bolts so you are able to pull the belts but also hold the tension without letting the belts slip back.

Pull the belts tight until there isn't any slack.

Next adjust the tension in the belts individually until the gantry sits straight. Use the left side of the frame as a reference.

Avoid over tensioning as this can result in greater vibrations and put unnecessary strain on the motor shafts.

Trim any excess, leaving approx. an inch free for any future adjustments.

With the belts tensioned manually move the tool carriage around to allow the pulley heights to settle into position. Make sure both belts are on their idlers and that motion is smooth.

The ideal position for all of the pulleys should be approx 2mm above the end of the motor's shaft.

Tighten the set screw against the flat of the motor shaft.

If you have the enclosure upgrade we recommend installing the rear panel now.

Rear Enclosure Panel

M4 x 8mm Button Head Bolt

M4 T-Nut

Fix the 9733 part cooling fan to the rear of the frame.

9733 Part Cooling Fan

M4 x 40mm Button Head bolt

M4 x 4mm Spacer

M4 T-Nut

Fix to the rear of the frame the 3D Printed cable relief bracket.

3D Printed Cable relief Bracket

M4 x 12mm Button Head Bolt

M4 T-Nut

Ensure it lines up with the fan opening.

Fix the silicone side of the CPAP cooling hose to the Fan.

Secure it in place with a cable tie.

Fix the cut side of the hose to the fan shroud on the tool carriage. Use Cable ties to secure it in place.

We recommend cutting a further 15cm off this hose.

V2 of this fan shroud will be available to download and print very soon.

Fix to the servo the extension cable.

Wrap all of the cables coming from the Tool Carriage into the remaining length of the braided cable sleeving.

The cables should include: The Eddy USB cable, the Endstop cable and the Servo cable.

Fix to the cables the nylon cable support guide as shown with cable ties.

Loosely fix the air hose to the support guide with one cable guide.

Feed the cable from the cooling fan into cable sleeving.

If you are installing the enclosure, also add to this cable loom the extension cable for the filter fan.

Ready to move onto the next stage? Click here.