Silk PLA and PLA+: which temperature to use and why they lose shine, have weak layers or clog

Symptom

Silk PLA comes out matte or with uneven shine, its layers split easily or it clogs at high speeds; or you do not know which temperature to use for a PLA+ because it does not behave like regular PLA.

Likely causes, from most to least likely

1. Silk PLA contains pearlescent additives: it needs a bit more temperature to melt and bond layers well; Bambu Lab puts it normally between 210 and 240 °C.
2. Outer wall too fast or with speed changes: the shine drops and becomes uneven.
3. Silk printed at high speed: Sovol warns it has poor wear resistance and is not suitable for very fast printing.
4. Damp filament: silk shows strings and uneven shine; Elegoo requires drying its PLA Silk before use.
5. PLA+ printed with a regular PLA profile: it is a tougher modified PLA and its range can differ (Elegoo gives 200-230 °C for its PLA+ and 190-230 °C for its PLA).
6. Thick layers on curved surfaces: the stair-step shows and shine is lost.

Checks to tell which one it is

• Read the temperature range on the spool label: it overrides any generic profile.
• Check the outer wall speed in the slicer preview: it should be low and constant.
• If layers split when you bend the part, you are printing too cold.

Before you start

Before taking anything apart, cleaning or adjusting it, switch the printer off and unplug it, unless a step says otherwise, and do not touch the nozzle, the heater block or the bed until they have cooled down. If in any doubt about electricity, heat or moving parts, stop and ask a professional.

Step-by-step fix

1. Raise the silk temperature

   Raise the temperature within the spool's range: Bambu Lab uses 235 °C for its PLA Silk and Elegoo gives 190-230 °C for its own. Look for the highest temperature in the range that does not cause stringing.

   Check: Layers bond well and the shine improves.

   If that does not fix it: Adjust the outer wall speed (next step).

2. Slow, constant outer wall

   Set the outer wall to 40-60 mm/s (Bambu Lab suggests starting at 50) and stop the slicer slowing it down for minimum layer time, so the shine is even. On fast printers, reduce overall speed by 30% with silk (Sovol suggests about 120 mm/s at 0.2 mm layers).

   Check: The shine is even and there are no clogs.

   If that does not fix it: Adjust layers and orientation (next step).

3. Thin layers and display face upright

   On parts with curved surfaces, use 0.16 mm layers and orient the face that will be on display upright on the plate (Bambu Lab).

   Check: The curved surface reflects light continuously.

   If that does not fix it: Dry the filament (next step).

4. Dry and store

   Dry the spool before printing (Bambu Lab: 55 °C for 8 h; Elegoo: 50 ± 5 °C for 8 h) and store it sealed with desiccant below 20% relative humidity.

   Check: Stringing and uneven shine disappear.

   If that does not fix it: Try another spool of the same type to rule out a bad batch.

5. PLA+: use its own range

   Use the range on the PLA+ label instead of a regular PLA profile. As a reference, Elegoo gives 200-230 °C nozzle and 35-65 °C bed for its PLA+, and recommends drying it (50 ± 5 °C, 8 h) and storing it below 20% humidity.

   Check: The part has good layer bonding and no strings.

   If that does not fix it: Adjust in 5 °C steps within the range.

Prevention

• Always start from the temperature range on your spool's label.
• Print silk slower than regular PLA, with a constant outer wall.
• Store silk and PLA+ in a sealed bag or box with desiccant.

Still not fixed?

Tell usi3d's AI about your case: choose your printer, describe what you see and add photos if you like. It proposes checks step by step, with their sources.

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Printers it applies to

Any FDM (filament) 3D printer, from any brand.

Material: PLA.

Official sources

This guide summarises the official documentation linked here:

• Bambu PLA Silk / Silk+ Filament Printing Guide · Bambu Lab
• Elegoo PLA Plus filament (specifications) · Elegoo
• Elegoo Silk PLA filament (specifications) · Elegoo
• Elegoo PLA filament (printing temperature) · Elegoo
• Guide to FDM Printing Filament (PLA series) · Elegoo
• The nozzle is clogged and the filament cannot be extruded (SV08, silk filament speed) · Sovol