What a UV printer jig does
A UV printer jig is a flat plate with one pocket per blank. You drop keychains, coasters, phone cases or golf-ball holders into the pockets, print one artwork file laid out on the same grid, swap blanks, and print again. Nothing is re-aligned between runs.
eufyMake says it plainly in its own E1 tips: “a jig ensures every single piece is placed in the exact same spot” and “removes the need to realign each piece manually.” The same page explains why the camera alone falls short on a full bed: alignment drifts toward the edges because of lens distortion, the camera is most accurate in the center, and “if you have to print near the edges, using a jig is the best way to keep things 100% accurate.”
The second job of the jig is less obvious but more important on a flat bed UV printer: it sets every blank at the same height.
Why blank height matters more than position
UV inkjets fire droplets across a small air gap. If the gap grows, dots spread and the print goes soft; if it shrinks to zero, the head strikes the part. eufyMake’s E1 FAQ sets hard limits for flatbed mode:
- Maximum object height recognized by the camera: 60 mm.
- Maximum printable object height: 100 mm (Zero-Point alignment raised this to 130 mm in the July 2026 Studio release).
- Maximum allowable height variation on a single object: 2 mm.
- All objects placed on the platform must be at the same height.
The E1 measures height with a laser that “detects the highest point on your object to set a safe printing height,” and the spec sheet lists an automatic height adjustment range of only ±0.5 mm. So anything higher than your blanks sets the head height for that high spot, and the blanks below it print blurry. eufyMake’s tips call out lifted tape edges and tilted magnets as two such high spots; the jig itself is a third if its top sits above the blanks. The same tips warn that Snapshot height can be off by 1 to 3 mm when you print on mats, so check the total height of mat plus material.
That gives the one rule every jig design below follows: the blank tops must be level with each other and above everything else on the bed.
Flat bed UV printers and their limits
The jig has to fit the print area and its thickness counts toward the maximum object height. These figures come from each manufacturer’s spec page or manual.
| Printer | Print area | Max object height |
|---|---|---|
| eufyMake E1 | 330 × 420 mm (13 × 16.5 in) | 100 mm; 130 mm in Zero-Point mode |
| xTool O1 Omni | 330 × 420 mm standard baseplate | Not stated in the manual; 7 mm emboss height |
| Mimaki UJF-3042MkII e | 300 × 420 mm (A3) | 153 mm (6 in) |
| Roland LEF2-200 | 508 × 330 mm (20 × 13 in) | 100 mm (3.94 in) |
The E1 places artwork from a camera snapshot plus laser height detection. The O1 Omni manual describes a contact image sensor that scans the object surface for positioning, with ±0.2 mm positioning accuracy listed. Check your own printer’s manual for how it locates artwork.
On a camera or scanner machine the jig mainly fixes height and spacing; the software still finds the pieces. On a printer that places artwork by bed coordinates, the jig is the alignment system, so it has to sit in exactly the same place every time.
Four ways to build the jig
| Jig type | How it is made | Best for | Watch out for |
|---|---|---|---|
| Laser-cut drop-in plate | One sheet with through-cut pockets, blanks rest on the bed | Blanks thicker than the sheet, quick to make | Blank must be thicker than the plate, or it sits below the jig top |
| Two-layer cut plate on a backing | Pocket layer glued or pinned to a solid backing sheet | Thin blanks such as 1 mm aluminum cards; sets an exact pocket depth | Backing must be flat; glue squeeze-out lifts blanks |
| 3D-printed recess plate | Plate with blind pockets of a chosen depth | Odd shapes, round items, mixed heights in one plate | Plate size limited by the printer bed (256 × 256 mm on a Bambu Lab A1), so large jigs are printed in tiles |
| Magnetic jig | Steel or magnet-backed base with magnetic stops | Fast changeovers, reusable stops | eufyMake warns a magnet sitting at an angle can become the highest point; seat every magnet flat |
The generator at the jig generator home page outputs both a laser-cut SVG/DXF and a 3D-printable 3MF/STL from the same layout, so you can choose the build method after you see the pocket count. For material choice, see best material for jigs.
Pocket depth vs blank height
Work out the depth from the blank, not from the sheet you happen to have.
- Measure the thinnest and thickest blank in the batch.
- Subtract 0.5–1 mm from the thinnest blank. That is the pocket depth (or the top-layer thickness on a two-layer jig).
- Check that the thickest blank stays within the printer’s tolerance of the others. On the E1, everything must be at one height and the automatic adjustment is ±0.5 mm, so a spread of more than about 0.5 mm across a batch is worth sorting out before printing.
Examples:
- A 3 mm acrylic keychain in a 2 mm recess stands 1 mm proud. Good.
- A 3 mm acrylic keychain in a 3 mm laser-cut plate sits flush; any burr on the cut edge becomes the highest point. Use a 2 mm plate or a backing layer instead.
- Natural materials vary. One slate coaster supplier lists its 3.0 mm thickness as “subject to variation,” and a buyer review of another supplier’s four-pack reports pieces ranging from 3 mm to 5 mm thick. Sort them by thickness, or 3D-print a jig with individual pocket depths.
For round items such as golf balls (at least 42.67 mm / 1.680 in in diameter under the Rules of Equipment), the pocket is a cradle that stops the ball rolling; the print surface is the top of the sphere. See the golf ball jig layout for the E1.
Print-head clearance and maximum height
Add the jig’s base thickness to the blank height before you compare it to the printer’s limit. A 6 mm 3D-printed base under a 60 mm tumbler cradle already puts the top at 66 mm, past the E1’s 60 mm camera limit and into Zero-Point territory.
Keep the jig flat. eufyMake notes that material which curls can cause a head strike, and recommends securing it tightly. Thin laser-cut plates in MDF can bow with humidity; 3D-printed plates can warp at the corners. Tape the plate down at the corners, away from the print zone, and press the tape flat.
Registering the jig to the bed
A jig only removes alignment work if it goes back to the same place.
- Corner stop. Fix two strips (or an L-shaped bracket) to the bed and push the jig into the corner every time. The generator engraves origin marks on the jig so you can line it up by eye as a second check.
- Camera machines. On the E1, the July 2026 Studio release added “jig batch positioning” that aligns multiple items to fixture holes at once. A jig built on a regular grid matches that workflow directly.
- Coordinate machines. Measure where the jig’s origin sits relative to the printer’s origin once, record the X and Y offset, and reuse it.
- Tape trick for checking. eufyMake suggests printing the offset outline of your design onto tape first and then placing substrates into the printed outlines. Doing the same with the jig’s pocket outlines confirms the jig and the printer agree before you print real blanks.
Making the matching artwork template
The jig and the artwork must share one coordinate system. The generator exports an alignment template at real size (SVG or PNG) that shows each pocket center, the bleed line and the safe area, plus a CSV of pocket centers for apps that take coordinates. Place each design on its pocket center, hide the template layer, and print. The details, including bleed choices for edge-to-edge prints, are in the alignment template guide.
For common layouts, start from a ready combo: 4 in square coasters on the E1 or 2 in round keychains on the E1. Blank dimensions for these and other items are listed on the blank sizes page, and the eufyMake E1 jig guide covers that printer in more depth.
Step by step
- Measure ten blanks for length, width and thickness, and use the largest outline.
- Choose clearance per side. Start near 0.2 mm for laser-cut acrylic and test; the jig clearance guide explains the numbers.
- Enter the blank, printer and spacing in the generator and let it maximize the pocket count.
- Make the test-fit coupon in the jig material and pick the clearance step that fits.
- Make the full jig, fix a corner stop, and check that blank tops sit 0.5–1 mm above the plate.
- Load the artwork on the alignment template, print one run on scrap, correct any offset, then print the batch.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Whole batch prints soft or misty | Jig, tape or magnet is higher than the blanks | Make pockets shallower or plate thinner; re-seat magnets |
| Some blanks sharp, others blurry | Blank thickness varies across the batch | Sort blanks by thickness or use per-pocket depths |
| Print shifted the same amount on every blank | Jig not against its stop, or template origin offset | Re-register to the corner stop; adjust offset once |
| Blanks rattle or rotate | Too much clearance | Drop one step on the tolerance ladder, or add a tighter insert |
| Blanks will not drop in | Too little clearance or melted cut edge | Go up one clearance step; check the laser kerf |