Part size guide: Small, Medium or Large?
The category sets the minimum order quantity for each design. You can check it yourself.
How I decide whether your part is Small, Medium or Large
Open your STL in a free slicer such as PrusaSlicer, Cura or Bambu Studio and read two numbers:
- Longest side (mm): the biggest of the three bounding-box dimensions (the X, Y and Z size shown for the object).
- Estimated weight (g): the filament weight for one part, at 0.2 mm layers and 15–20% infill, including any supports.
The larger category applies. I judge your part on its longest side and its slicer weight, and it goes in whichever category is larger. For example, a 120 mm part weighing 20 g is Medium, because its length puts it in Medium.
Size categories
| Category | Longest side | Weight per part | Examples | Minimum quantity |
|---|---|---|---|---|
| Small | up to 60 mm | up to 30 g | cable clips, small brackets, knobs, spacers | 50 |
| Medium | up to 150 mm | up to 150 g | enclosure panels, mounts, covers, jigs | 10 |
| Large | anything bigger | over 150 g | housings, large fixtures, trays | 5 |
A £75 minimum order (excluding postage) also applies to every order.
Special cases
Very large parts
Need a larger part? Send me the dimensions and intended quantity and I'll review what's possible. Very large parts are always a custom quote.
Very tall or thin parts
Examples are rods, long strips, or anything over about 150 mm tall on a narrow base. The longest side sets the category, whichever way up the part is printed. I may print the part lying down for strength and quality, or add a brim or supports. If that changes the weight, the time or how many fit per plate, I'll tell you on the quote. I recommend walls at least 1.2 mm thick (1.6 mm for ASA and TPU). Very small features may not print reliably, and I'll flag them.
Assemblies and multi-part kits
Every separate part is counted on its own, with its own category and minimum quantity. For example, 50 kits of a lid, a base and a clip means 50 of each part. A part printed in one piece with moving sections (such as a print-in-place hinge) counts as one part. Screws, magnets and threaded inserts aren't included unless they're listed on the quote.
Close to a boundary?
If one measure is only just over a limit, ask me. I often print the part in the smaller category.
I confirm the category on your quote. I check your file in my own slicer. Occasionally a part takes longer to print than its size suggests, so I may place it in a larger category. The category on your quote is the one that applies.
Or email me at info@stourworks.co.uk