Update Rev99 1/28/2017
While working on making a customized version of this Combo Slider Carriage, I discovered a couple of problems that I fixed in SliderCarriageCombo_Rev99.STL & .scad file. The big thing I forgot to do was upload the version mirrored so the belt clamping is on the right. The small thing I missed & fixed is the Rod nut trap on one side is 2mm further from the screw head. I will upload the customizable version as a remix. You should be able to change the Wheel width & the Rod width. I might add another option to be able to change the beltway width from the current 14.0mm width.
I decided to take a crack at adding a belt tension to the slider/carriage after a friend commented about needing some kind of belt tensioning. The narrow width between the rods was a bit of a challenge to get something to work, but think this idea is going to work well.
I started with the Belt Tensioner idea located here:
Mounting the tensioning horizontal would not work for me with the limited space, so after 3 or 4 versions, I got this to work. I also made a version using the grooved belt connection, but thought this self clamping method was better.
The modified dovetail joint I made with a default .3mm clearance between the mating parts. In the openscad source, SliderCarriageCombo_Rev98.scad, You can adjust this to .15, .2, .25 or .3mm clearance with the variable:
Size = 3 //15, 2, 25 or 3
The Width where the belt tightens I have set to 2.5, but other designs have used 2.2. You can change this with the variable:
Gap_Tighten_Wid = 2.5;.
You can change this value in both SliderCarriageCombo_Rev98.scad & SelfClampSlide_Rev10.scad
There is also an option to use the original M5 Phillips Flat head screw, but not sure there is enough plastic to work with since the spacers are separate from the slider now.
The variable to change is M5_Type = 1; //0 = Original Folger Tech Phillips Flat Head, 1 = Button Head
I would have preferred to put the dovetail female joint on the Combo slider Carriage, but for better print orientation without supports, I put it on SelfClampSlide. For printing I used eSun PLA+ with 50%vinfill on the SliderCarriageCombo with 7x 20mmx.5mm High discs places around the part to keep it flat on the print bed. Since slic3r 1.2.9 essentially gives full infill on the vertical walls, I use 20% infill on the SelfClampSlide with a 6mm brim to keep it on the print bed. My printer has a tendency to print about .3 to .4mm higher than designed, so I have 2 versions of the tapered spacers, One version at 12.0mm & the other at the original 12.35mm. Since I have included the openscad file for these, you can also adjust it to what you need.
I never liked the small M3 button Head or the M5 Phillips Flat head Hardware that came with this printer, so this is what I used to mount the 3 Combo Slider Carriages:
6x - M3x20mm Socket Head Cap Screws & Locknuts Rod Screws
3x - M3x10mm Socket Head Cap Screws & Jam Nut Limit Switch Screw
3x - M3x22mm Socket Head Cap Screws & Jam Nut Wheel Tension Screw
3x - M3x25mm Socket Head Cap Screws & Jam Nut Belt Tension Screw
9x - M5x30mm Button Head Socket Cap Screws for the Wheels
Here is a link to the Jam nuts & LockNuts in case you need them.
M3 Jam nuts: http://www.mrmetric.com/M50627
M3 Locknuts: http://www.mrmetric.com/M50350
M5 Locknuts: http://www.mrmetric.com/M50352
I also added a photo showing all the hardware I used.
You might have to sand or file the female dovetail connection since the overhang is 30 degrees & not 45. 45 degrees did not seem to work as it gave too little plastic above the joint. Test fit these parts before putting all the hardware together.
Here is the order in which I installed this Combo Slider Carriage.
- Add Limit Switch & Belt Tension Screw with Jam Nuts.
- Add Wheel hardware to the side with 2 wheels.
(M5x30mm Button Head Socket Cap Screw, Tapered Spacer, wheel & locknut)
- Slide the SelfClampSlide Plastic part onto Combo SliderCarriage
& add M3x25mm Socket Head Cap Screw & Jam Nut.
- Add the M5x30mm screw & tapered spacer to single side, but not the wheel or locknut.
- Place carriage on the vertical 2020 & add the 3rd wheel & Locknut.
- Tighten wheel tension screw as needed.
- Add the 2x M3Locknuts in the captive nut holes to mount rods & tighten the rods in the .
- Connect the top portion of the belt to self clamp on slider/carriage.
- Connect the bottom portion of the belt in selfclampslide at the lowest point you can.
- Tighten the M3x25mm belt tension screw to the tightness you desire.
This should give you 12 to 16mm of tensioning. I was not sure this would be enough, but turned out to be plenty for me.
- If you have enough excess belt & want to make the connection extra secure, you can add a wire tie to the bottom & top belt connections.
This Combo Slider Carriage has less hardware to install (no mounting carriage to Slider) than previous design & weighs only 1.79grams (.063oz) heavier on my machine.
I have not used this yet, but did check the movements by manually moving the sliders & I do not see any clearance problems. Let me know if you find any problems with the design.
I will also make a customizable width version of this since I need it for my Emmett-Delta project.