Product Spec Sheet

Accessory Rail Clamp v2.0

Easy ~3.5 hrs build time v2.0 · April 2026 PLA+

A 3D-printed tripod clamp fitted with a versatile accessory rail. Clamps onto your tripod leg and delivers an attachment point for all your small photography/astrophotography accessories including but not limited to: mini PCs, wire harnesses, cable guides, GoPro cameras, lights, powerbanks, batteries, USB hubs, and more.

Product Features

Attachment

Easy on, easy off tripod clamp design

Rail Standard

Standardized and extendable accessory rail system

Clamp Features

Padded clamp surfaces and latch slip guard

Accessory Target

Universal — Whatever can be designed around the rail

Materials

PLA+ printed parts, standard nuts, screws, and rods

Footprint

Dimensions scale with tripod leg diameter

Bill of Materials

Item	Qty	Spec	Notes
M3×10mm Screws	2	Stainless	Pan head
M3x30mm Screw	1	Stainless	Pan head
M3 Nuts	4	Stainless
M3 Lock Nut	1	Stainless
⌀3mm Rod	1	Brass	Cut to 47mm length
1.1mm Foam Rubber Sheet	~25-65cm²	Sticky-back Sheet	Cut to size

3D Printed Parts

###_ClampBase.stl

MaterialeSUN PLA+

Walls3

Infill15% Adaptive Cubic

SupportsTree Auto

Est. time~50m

Est. weight~20g

###-ClampLid.stl

MaterialeSUN PLA+

Walls3

Infill15% Adaptive Cubic

SupportsTree Auto

Est. time~41m

Est. weight~13g

###-Stencil.stl

MaterialeSUN PLA+

Walls3

Infill15% Grid

SupportsNone

Est. time~12m

Est. weight~3g

000-AccRail.stl

MaterialeSUN PLA+

Walls3

Infill15% Adaptive Cubic

SupportsMan. Norm. Snug

Est. time~23m

Est. weight~7g

000-ClaspPin.stl

MaterialeSUN PLA+

Walls3

Infill15% Adaptive Cubic

SupportsTree Auto

Est. time~31m

Est. weight~3g

000-ClaspPinRing.stl

MaterialeSUN PLA+

Walls3

Infill15% Adaptive Cubic

SupportsTree Auto

Est. time~15m

Est. weight~2g

000-Knob.stl

MaterialeSUN PLA+

Walls3

Infill15% Adaptive Cubic

SupportsRaft + Tree Auto

Est. time~20m

Est. weight~2g

### Represents the tripod leg diameter of the part in mm with a numeric scale of 1 (ie. 445 -> 44.5mm). Files beginning with 000 are universal parts that do not change regardless of the tripod leg diameter. The ###-Stencil.stl outer edge is used to trace out the foam pad for placement inside of each clamp half. You may adjust material, walls, infill, etc. to your desired preference.

Print Settings & Assumptions

Layer height

0.2mm

Nozzle

0.4mm

PLA+ temp

220°C / 220°C

Bed temp

60°C / 55°C

Ironing

Topmost Surface

Files are sliced for a 0.4mm nozzle at 0.2mm layer height. Tolerances assume a reasonably calibrated FDM printer as parts are designed for tight interference fits. Printed and validated on a Bambu P1S.

Tools Required

Tool	Used for
Calipers	For precise measurements
Phillips Head Screwdriver	M3 machine screws
Pliers / Multi-tool	Support removal
Hobby knife / scissors	Cutting foam padding
Small Hammer	May help to gently drive the 3mm brass hinge rod

Assembly Guide

Install pocket nuts in Accessory Rail (000-AccRail)

Press one M3 nut into each of the two recessed pockets on the Accessory Rail.

Attach Accessory Rail to Clamp Base (###-ClampBase)

Check hole alignment between the Accessory Rail and the Clamp Base pocket and then slide the Accessory Rail into the Clamp Base pocket. This is an extremely tight interference fit and some stiff force may be required to seat the Accessory Rail all the way to the back of the Clamp Base pocket and secure using 2 M3x10mm machine screws.

Fit the Clasp Pin Ring (000-ClaspPinRing) onto the Clamp Base.

Position the Clasp Ring in the Clamp Base cutaway. There are two holes on the surface of the Clasp Ring - Position the smaller hole of the Clasp Ring to point towards the Clamp Lid (###-ClampLid)

Install pocket lock nut in Clasp Pin (000-ClaspPin) (

Press the lock nut into the Clasp Pin taking care to orient the nylon inlay to point away from the flat cutaway on the outside of the Clasp Pin.

Attach Clasp Pin to Clamp Base and Clasp Pin Ring

Slide the Clasp Pin through the Clamp Base and the Clasp Pin Ring. This should be snug, but not overly tight. Align the screw hole taking care to ensure that the larger Clasp Pin Ring hole lines up with the Clasp Pin flat cutaway.

Attach M3x30 machine screw

Screw the M3x30 machine screw through the Clasp Pin Ring above the Clasp Pin flat cutaway. Tighten the screw as far as it will go, however, do not over tighten.

Attach Clamp Base to Clamp Lid

Fit the Clamp Base to the Clamp Lid by aligning along the hinge end. Press and drive the 3mm brass rod all the way through the hinge. This is a tight interference fit and you may use a hammer to gently and carefully drive the pin through.

Prep and attach the Knob (000-Knob)

Press fit one M3 nut on the bottom of the knob and press fit one M3 nut on the inside of the Knob. The nut on the inside is difficult to place. You can use another long M3 screw to line it up and secure it in place. After the nuts are installed, attach the knob to the M3x30mm screw but do tighten it down yet.

Cut and place the foam rubber pads

Use the Stencil (###-Stencil) to trace a pattern onto the back of the foam rubber pad using the outside edge of the stencil. Repeat so that you have two identically sized pads. Peel the backing tape off of one of the foam rubber pad and carefully place along the inside wall of the Clamp Lid (Start by placing the short end of the foam rubber pad 6mm away from the midline of the hinge). Repeat for the Clamp Base.

Attach the Accessory Rail Clamp to the tripod

Open the clamp and position around the tripod leg. Close the clamp around the tripod leg and swing the knob over the Clamp Lid. Tighten knob until space between the clamp halves is between 0.5-1.0mm. The first time you attach the clamp, there will likely be a sizable gap between the two halves. Slowly tighten the knob to draw the halves together - the foam rubber will need to compress a bit during the first application and this is intentional.

Known Limitations

Not rated for payloads over 2kg on the accessory rail.

The clamps are designed for specific tripod leg diameters as specified in the ###- prefixed files. Please note that these clamps will not fit larger or smaller tripod legs than they are designed to fit.