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SUNLU 3D Filament & Dryers Review

3D Printingvia UpPromoteFrom PLA from ~$13-17/kg; filament dryers ~$40-70

The budget filament that prints above its price - and the filament dryers that quietly fix half of all print failures.

8.6
out of 10
Excellent
Reviewed by Mike · Founder & lead reviewer
Our verdictSUNLU became the default consumable brand of hobby 3D printing by being boringly consistent: PLA and PETG with tight diameter tolerance that feeds without drama, spool after spool, at prices that make experimentation guilt-free. Colors are broad, tangles are rare, and the PLA+ line survives functional-part duty. The catalog's sleeper hit is the filament dryer - a heated box that rescues moisture-soaked spools and, used routinely, deletes the stringing-and-popping failure class entirely (PETG and nylon users: this is not optional equipment, whatever brand you buy). Exotic engineering filaments and color-critical batch matching belong to pricier houses; the everyday 90% of printing belongs to spools like these.
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✓ Pros

  • Consistent diameter and winding - the two properties that actually prevent failed prints
  • Priced for volume: iterating, calibrating and bulk printing without spool anxiety
  • Filament dryers are the best money-per-fixed-failure upgrade in the hobby
  • PLA+/PETG lines handle functional parts, not just decorative prints

✗ Cons

  • Color consistency can drift between batches - buy project quantities in one order
  • Exotic/engineering materials (ASA, PC, filled nylons) are thin in the lineup
  • Store shipping times vary by region; plan ahead rather than printing on fumes

Why the boring spool wins

Failed prints are rarely the printer: they are wet filament, inconsistent diameter, and bad winding that cross-locks mid-print at 2 a.m. Budget filament earned its bad name on those three sins, and SUNLU's whole brand is not committing them. Tolerance stays tight (extrusion stays even), spools unwind clean, and PLA behaves identically from the first meter to the last. For the everyday printing that is most printing - brackets, prototypes, toys, fixes - paying double for boutique spools buys almost nothing.

The moisture sermon

Filament is pasta that drinks air. A spool open two humid weeks prints with stringing, bubbles, weak layers and a matte fuzz people blame on their printer. A filament dryer - SUNLU's are the category's value pick - bakes spools back to health and can feed the printer directly from the dry box. PETG users, this is your missing upgrade; PLA users, it is why last month's spool got worse. Rule of thumb: if prints degraded and you changed nothing, dry the filament before touching a single slicer setting.

Should you buy it?

For everyday PLA/PETG at consumable volume: yes - stock three or four spools and print without rationing. Add the dryer with your first order; it will pay for itself in un-failed prints within a season. Buy boutique only where it matters: color-matched production batches, exotic mechanical requirements, or silk finishes for display pieces. The workhorse shelf, though, belongs to spools you do not have to think about.

Best for

Everyday 3D printing where filament is a consumable - and anyone whose prints mysteriously degraded (spoiler: moisture).

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