This is my first accessory to improve the SmartrapCore (3D printer from Smartfriendz). Here the 3D SmartrapCore:
I built a wood reel (to spare my filament instead of a printed reel that would cost more than 15€ with plastic only, here wood, nuts and bolts, metal squares and plastic support cost only 7€).
I was inspired in this idea by this:
But I built it with wood!
This reel is designed for filo3D filament (bought without a furnished reel, bulk filament) (inside diameter of the reel: 19cm, outside: 30cm)
I designed a piece to attach this reel: a plastic support. It is intended to be uses with a M5 (5mm diameter) bolt and there is two holes for an eventual attachment to the box (I did not attach , plugging in the box is enough for solidity and stability).
This plastic support is the STL file delivered here.
I used too this usefull element to guide the filament for the turning around the 3D box:
First build you reel support.
Buy a 3mm thick MDF in dimensions 30cmx30cm.
Use a compass and draw a circle 30cm in diameter (15cm radius) center in the MDF wood.
Then cut with a very heavy scissor (I used a metal scissor, able to cut small thickness metal sheets). You can use another more complicated mean to cut the circle, scissor was the easiest I found.
Don't drill yet the central hole since you will need its precise emplacement for future measurements.
Buy 6 metal squares (mines are 5cm in length for each arm, with too M4 holes)
Then draw 120° apart axis from the center of the circle. Place a metal square on each axis so that the length from the center of the plate to the metal square is 9.5cm: you want a 2x9.5cm=19cm inner radius of your reel).
Mark holes with a pen and drill with 4mm diameter driller for each metal square.
Drill the central hole with a hole big enough to have access to the central shaft of your ball bearing (if using one, which is not essential). I drilled with a 8mm diameter.
Buy M4 nult, bolts and washers. You need 9 of each. Then attach your metal squares with nuts, washers and bolts.
Glue the ball bearing on the wood plate, so that you tie only the outside peripheral of the ball bearing to the plate and the inner center of the bearing can move freely.
Buy a 50mm length M5 bolt and buy three M5 nuts.
Then you will place the M5 bolt inside the bearing (my bearing has a M5 hole).
Then print the reel support. Perint it so that you won't need to use support: on the side.
Put the M5 bolt through the plastic support and tie with too nuts on the side out of the box. Plug the plastic support on the top of the box (right side). Then put the bolt through the bearing in the center of the reel; and tie with another nut.