REPLACEMENT PARTSAudio
Knobs and mechanism parts for vintage audio equipment
Small plastics for amplifiers, tape recorders, and turntables from the 70s and 80s
Reference part · Potentiometer knob
26 × 26 × 18 mm · PA12 · Reference geometry: a sleeve with a locating feature and a knurled grip.
- mass per part
- 4.1 g
- working hours for a quotation
- 24 h
We confirm pricing, currency, lead time and delivery terms individually for international orders.
Parts we make for this application
8 examples
- Potentiometer and rotary switch knobs
- Pocket flap catch and hinge brackets
- Gears and pulleys for mechanism drives
- Drawer runners and damper slide guides
Show 4 more examples
- Buttons, keys, and their guides
- Legs, spacers, and housing pads
- Socket covers, shields, and plugs
- Needle holders, arms, and lifters in turntables
1,600 MPa
PA12 specimen flexural modulus (ASTM D790-15)
Why SLS for this part
Modulus describes specimen stiffness. Knob or catch deflection also depends on cross-section, mounting and force. Shaft fit, mechanism travel and wear are assessed from measurements and trial assembly; modulus does not establish them.
PA12 Material Data SheetWhat this process cannot do here
No fine print
- We do not reproduce parts under mains voltage. Insulation is not something declared on the powder datasheet.
- We do not reproduce the manufacturer's logos, function descriptions, or scales. We reproduce the geometry that makes the part work.
- Shade and texture are agreed on a physical sample. Dyeing requires a minimum of 20 parts and an individual quote; colour is confirmed for the job.
- We do not produce optical parts or display windows. The sinter is matte and does not transmit light.
- We do not guarantee compliance with a part we have not seen. A catalog number alone is insufficient.
- We do not reproduce drive belts or anything rubbery. This is a separate technology and a separate supplier.
How your project moves forward
- Sample and mountInclude the sample or photos with calipers. Show the shaft and mating component.
- Measurements and modelFor a gear, include its mating gear and shaft spacing. Measurement scope is agreed.
- Trial partFit-check and adjustment scope are agreed in the quote. Check the part in your device.
- Selected quantityConfirm quantity after checking assembly. Further geometry changes are agreed separately.
What the quotation covers
Private customers have no minimum order or automatic price. Geometry reconstruction and printing are quoted separately; the ranges below cover model preparation.
We confirm pricing, currency, lead time and delivery terms individually for international orders.
3D Scanning · EinScan Rigil
We measure worn parts instead of guessing
Photographs with a ruler help assess scope. Simple dimensions can be measured manually; we consider scanning for free-form surfaces. Wear is recorded as the part's condition; reconstruction dimensions are agreed separately.
- Laser HD specification, 100 mm part
- 0.046 mm
- Scan and Mesh, from
- PLN 250.00
Manufacturer's Laser HD data; not a measurement of your part or a printed-part tolerance.
What remains with you
- MeshRecords accessible surfaces in their current condition, including wear. A mesh can be edited, but has no operation history or dimensions from a parametric CAD model.
- Solid modelReconstructs geometry using scans, measurements and available documentation. We agree critical dimensions and assumptions; a parametric model is created where possible.
- Deviation reportComparison with supplied CAD: a deviation map on scanned surfaces and agreed sections. We agree inspection scope and alignment datums before work; unseen areas remain outside measurement.
What to prepare for a quote
Device and sample
Device model, part photos and an intact sample if available. Include its mating component; mark wear, missing surfaces and drawing or file units.
Shaft and gear mesh
Shaft section and diameter, flats or splines, insertion depth and clearances. For a gear, include the mating pair, tooth count and shaft spacing.
Operation and appearance
Forces, use frequency, temperature at the part and exposure duration. Identify visible surfaces, a colour reference, quantity and trial-part inspection plan.
Send what you have. We will clarify the remaining details when reviewing your enquiry.
How to order
I need a model
Attach photos with a ruler or a drawing. Describe the application; model preparation is quoted separately.
Send photos and a descriptionI have a 3D model
Upload your model and choose the parameters. SLS and FDM prices are indicative; an engineer quotes SLA.
Quote the part from a modelFrequently asked questions
I have only one complete knob out of four. Is that sufficient?
An intact part is a useful sample. We check whether the remaining shafts have the same section, diameter and mounting depth. Send photos and measurements; confirm the set geometry after the fit check.
The gear has broken teeth. Can it be reproduced?
Send preserved teeth, the mating gear and shaft spacing. A worn fragment may not establish module, pressure angle or profile shift. Measurement and trial-meshing scope are assessed before modelling.
Will the part withstand heat from inside the amplifier?
PA12 HDT is 87 °C at 1.8 MPa in the test, not a guaranteed service temperature. Tell us the temperature at the part, exposure time and mounting. We decline parts resting directly on a heat sink.
Will it be obvious that this is not an original?
Sintered PA12 has a matte, grainy surface. Fuse Blast cleaning does not guarantee the original texture or gloss. Identify visible surfaces and a reference; finish and colour are agreed before printing.
How do we fit a knob to a potentiometer shaft?
State diameter, shaft section, flats or splines, insertion depth and mounting method. Mark datums and required clearances. A trial knob helps check assembly; the device model does not replace shaft measurements.
Will a small printed gear reproduce mechanism performance?
We need the gear pair, shaft spacing, load and required backlash. SLS has limits for small features and mating surfaces. Material and trial scope are assessed for the mechanism; PA12 specimen data do not establish its lifetime.
Send your part for a quote
Attach photos with a ruler or a drawing. Describe the application; model preparation is quoted separately.
Send photos and a description Quote the part from a modelQuick contact
Need help describing the part?
Leave your phone number or email. Tell us which part broke and we will help identify the information needed for a quote.
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