3D. 1mm spacers, for 2.38mm axle (10/unit)

Millimetre precision for your slot axle: 3D spacers of 1mm for 2.38mm

The reference SRP-SE1 from 3DSRP enters the category of spacers, bearings, and stoppers with a very specific proposal: to control the position of each element on the rear or front axle of your 1/32 slot car to the tenth of a millimetre. Ten units per pack, all with a constant thickness of 1mm and an internal diameter adjusted to the 2.38mm (3/32") standard.

Function and performance

A poorly chosen spacer —too thick, too thin, or with an irregular internal diameter— generates lateral play on the axle or, conversely, introduces friction. With the SRP-SE1, the measurement is exact: 1mm thickness without variation, allowing them to be used individually or combined to achieve the exact spacing required for each setup. The direct result is:

• Precise centring of wheels relative to track width.
• Crown aligned with the pinion without additional corrections.
• Elimination of lateral friction that reduces speed and acceleration.
• Quieter operation of the rotating assembly.

3D manufacturing: a real advantage on the axle

The high-resolution 3D printing used by 3DSRP for these spacers offers a tangible advantage over traditional brass or aluminium spacers: the weight is significantly lower. In an axle that spins at thousands of revolutions per minute, reducing rotational mass —even by a few milligrams— translates to a quicker response to the throttle and less inertia when braking. For club racing or training setups where fine-tuning is sought, this detail makes a difference.

The technical plastic material used maintains its shape under normal usage conditions in 1/32 slot, without deformation or thickness variations that compromise the fit.

Compatibility and installation

These spacers are designed exclusively for 2.38mm (3/32") axles, the most common diameter in 1/32 slot. They are compatible with any car that uses this axle standard, regardless of the chassis or motor configuration —sidewinder, inline, or anglewinder—. Installation does not require special tools: simply slide them onto the axle in the desired position before securing the wheels or crown.

By including 10 units per pack, you have enough margin to prepare several cars or to experiment with different thickness combinations until you find the optimal track width.

Common mistakes when using spacers

• Not checking the axle diameter before purchasing: always confirm that your axle is 2.38mm (3/32") and not 3mm or another standard before installing these spacers.
• Assuming that "more spacers = better fit": the goal is to eliminate just the right amount of play, not to create lateral tension on bearings or the chassis.
• Mixing spacers of different thicknesses without measuring: always combine with a caliper or precision ruler to ensure that the sum is the actual measurement you need.

Frequently asked questions

What axle size are these spacers designed for?

Exclusively for 2.38mm axles, also known as 3/32" axles. It is the most common standard diameter in 1/32 slot cars.

Can I combine multiple SRP-SE1 spacers to achieve a greater thickness?

Yes. With a constant thickness of 1mm, you can stack two or more units to achieve separations of 2mm, 3mm, or whatever measurement you need, with complete reliability.

Are they suitable for both front and rear axles?

Yes. They work on any 2.38mm axle of the car, whether it is the rear drive axle or the front steering axle.

What real advantage do they have over brass spacers?

The main benefit is the lower weight. By reducing the mass on the axle, rotational inertia is decreased, which improves the car's response in both acceleration and braking.

How many units are included in the pack?

The SRP-SE1 pack includes 10 spacers of 1mm.

Is any tool required for installation?

No. They slide directly onto the axle. However, it is recommended to use a caliper to verify the final position before adjusting the stoppers or the wheel.

The 3DSRP SRP-SE1 is a pack of 10 precision 3D-printed 1mm spacers for 2.38mm (3/32") axles, designed for 1/32 slot car preparation. Ideal for fine-tuning track width, wheel centring and crown alignment, these lightweight plastic spacers reduce rotational mass compared to brass or aluminium alternatives. A reliable solution for club racing and serious slot car builders looking for consistent, friction-free axle setup.