Hardware Reference
In-Depth Information
snugly on the bearings, tighten everything up, and affix the bearings to the saddles with small
zip ties. Then, align the
y
-axis drive belt with the dog and push the belt into the dog. Move the
carriage fore and aft to assure motor and idler are aligned properly and tighten everything up.
Now make sure you have everything installed correctly. Ensure that the
y
-axis is plumb with
the
x
-axis. You can use calipers or measuring tape to ensure equidistance on each side between
the
x
- and
y
-slide rods. (
Please note
: Never skimp on the alignment as it will become incredibly
important when we get to the stage of actually printing.)
You can make the following optional design change to make leveling the bed easy in the
future: if you want you can use four M3 × 20 mm screws instead of four M3 × 10 mm screws
for ataching the bed. This will require eight more M3 nuts (12 total), but allows for easy bed
leveling in the future. To do this, just put an M3 nut in the nut trap on the corner pieces and
screw the M3 × 20 until it is tight. Then screw another M3 nut down the M3 × 20 and put the
heated bed on top and secure with another M3 nut. Repeat these steps for each corner piece.
You may want to do the initial setup to make sure the layup is proper and epoxy is set before
changing.
Additional components you will need to complete the
y
-axis are the following:
y
-belt of 125 mm
Two belt ends
Zip tie
M3 × 20 mm and two M3 nuts and washers
Next, it is time to mount the
y
-axis as shown in
Figure 5.28
. Orient
y
-motors facing you,
push the nuts to the left side of the frame and tighten jam them up. Pull the excess
y
-axis guide
rods toward the side with the motor and tighten them down. Push two wire ties through each
saddle. You will find it easier to pull them through using needle-nose pliers. Mount the heated
bed to your printer with the wires facing the Melzi and line up all your bearings. If the
z
-axis
is getting in the way, move the
z
-axis nuts up. Next, tighten down the wire ties over the bear-
ings. Now, slide
y
-axis back and forth—while trying to minimize friction—and then tighten
the M8 nuts in place. The
y
-axis should slide back and forth with very litle drag—adjust the
y
-rods as needed and slide it back and forth until it slides smoothly.
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