Ultimaker 2 Belt Aluminum Slider, 8mm Shaft
Brackets and structural parts · 1 option in stock
Brackets and structural parts — motor mounts, end-stop mounts, bed mounts. The parameters are listed in order of importance: the one at the top decides the most, and no amount of care further down makes up for getting it wrong.
This page lists 1 option, from ¥51.
What this part is
Ultimaker 2 belt aluminium slider, 8 mm bore for the shaft, clamping the open belt at the side. It is the sliding element of the UM2 gantry XY — four of them make the XY plane.
The parts of this item
Figure 1 — A bracket comes down to four things: the two leg lengths, plate thickness and hole size — drill one hole wrong and the part is scrap
The parameters that matter
Not every number on a part like this is worth the same. These are the ones that decide whether it fits and works, and what to look at for each.
| Parameter | What to check |
|---|---|
| Bore | 8 mm, on an 8 mm shaft. Too much clearance and it rocks, which shows up as ripples on the print surface. |
| Belt clamp | By belt width. If it does not clamp hard the belt slips — lost steps and shifted layers. |
| Material | Anodised aluminium. Stiffer than the original plastic part, and a little heavier. |
Reading the part numbers
| Part no. | Configuration |
|---|---|
P3-043 | single configuration |
You can order by part number or by selecting the parameters. The part number is fastest, but it does not always encode every parameter — the selector on this page is the authority.
6 common mistakes
- Hole spacing has to match. One millimetre out and it will not go on; drilling it out removes the material that was taking the load.
- Some brackets are handed. A left-hand part fitted on the right puts the mounting face on the wrong side.
- Do not repeatedly strip aluminium threads. Use a thread insert or a standoff instead of winding a screw in and out of soft aluminium.
- Check the fold direction. A bent bracket only carries load in one direction.
- Measure before you order. Take the old part off and measure it, or send us a photo with the caliper reading — that beats guessing from a model number every time.
- Everything here is in millimetres. Where a size is imperial, convert it: 1" = 25.4 mm, 1/4" = 6.35 mm, 3/32" = 2.38 mm.
Telling it apart from lookalikes
Against an LM8UU linear bearing slider: the LM8UU recirculates balls, so friction is low but chips will kill it. The aluminium slider is a plain sliding fit — accuracy comes from the machining, it tolerates dirt, and it has a little more drag.
Confirming it is the right part
This page has one configuration, so there is nothing to choose — which makes confirming that it is the right part more important than studying the specification. Three steps is enough:
- Measure the mating dimension — the one place this part touches something else: bore, shaft, thread, tube OD, or hex across flats. It is the number people get wrong, and half a millimetre out means it will not fit.
- Measure the outline and the mounting hole spacing. Two parts that do the same job from two makers often differ by 2–3 mm between holes: it looks like it will fit, and it goes on crooked.
- Send us two photographs: one general view showing the machine and where the part sits, and one close-up with the caliper reading in shot. If the machine has a nameplate, include it — plenty of these parts are specific to one machine, and the model number locates them faster than dimensions do.
When to replace it
You do not replace this until it fails — but "still looks usable" and "still reliable" are two different things. Any one of these and it is time:
- Deformed, or the holes elongated so the part no longer sits where it should.
- Cracks at a weld or a fold.
Fitting and use
Check before fitting
- Try the thread and length by hand first. If it does not run down smoothly, it is the wrong spec — do not force it with a wrench.
- Measure blind-hole depth. Thread length must be shorter than the hole, otherwise it bottoms out and splits the material.
- For a through hole, check the bolt is long enough to clear the parts and show 2–3 threads.
Tightening
- Run it down by hand until it seats, then use the tool. If it strips by hand, change it — do not force it.
- When several screws hold one part, tighten diagonally in 2–3 stages. Do not take one all the way down first.
- "Seated plus a little" is enough. Brute force stretches the screw or crushes the part. Where a torque is specified, use it.
Staying tight
- Under vibration add a spring washer, a nylon-insert nut or threadlocker. Torque alone will not hold.
- Stainless into stainless galls. Put a little anti-seize on before assembly.
- Where something comes apart repeatedly, use a threaded insert rather than re-cutting the thread in aluminium.
Three things not to do
- Do not treat length as a spec. M6×20 and M6×25 are different parts — one bottoms out, the other does not reach.
- Do not mix coarse and fine pitch. They look alike, bind after two turns, and forcing it destroys the thread.
- Do not reuse a screw that has been stretched, in high-strength joints. Once it has been torqued and released, replace it.
Matching parts
- Motor, rail or bed of the matching model
Lead time, custom work and shipping
- Stock sizes: dispatched in 1–2 working days, subject to stock
- Custom: non-standard sizes, materials and treatments are possible — send quantity and drawing
- Shipping: from Shenzhen; domestic courier by default, DHL or dedicated line for export
- Volume: quantity pricing available, contact us for a quote
If you cannot find the size you need, or you are not sure which one fits, send us the problem you are solving — what machine it goes on, the dimensions of the part you have, what it has to achieve — and we will match it.