300mm Round Plastic Base
Corners detected: 0. Tolerance: +/- whatever. Scale: 1:1 (regrettably). We measured it again. Nothing changed.
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DWG · Product Information
PROJ: BAS/RO/300/PL · SHEET 2 / 4
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Product overview
OBS-BASE-300-RND | Material: PLA / PETG | Colour: Black | FDM 3D Printing
THE 300 INCIDENT · FILE 300-R
300mm ROUND BASE
A large-format display & diorama base. Also, a disclosure.
filed by the department that maintains land has no corners
[ INCIDENT REPORT ]
I. THE BRIEF
We were asked for a bigger base. We asked how big. The reply never came. In the absence of a stated limit, we concluded there wasn’t one, and proceeded on that understanding. This understanding has since been described, in the review, as “the root cause.” We dispute the tone.
II. THE ESCALATION
Progress was logged in millimetres, then in “surely that’s enough now,” then in a silence we chose not to break. A colleague raised a formal concern at 200mm. It was minuted. Work continued. At 260mm the same colleague raised the same concern, louder, and was thanked for their input. It was minuted again. The colleague has asked us to note, here, that they were right. We have noted it. We have not agreed to anything further.
III. PRIOR VERSIONS
Earlier attempts existed. A 250, and a 275. The 250 was destroyed in accordance with a policy we wrote immediately afterward, specifically to establish that its destruction had been correct. The 275 is a harder subject. It was signed out one evening and never signed back in. We have chosen to record it as destroyed, because the alternative is that it is still somewhere, and we are not equipped to hold that thought during working hours. No images survive of either. This too was policy — drafted, as ever, after the fact.
IV. THE NUMBER
At 300mm the printer stopped of its own accord. We never established why. It had power. It had filament. It simply declined to continue, and we elected to read this as the design being finished. No one has since produced an argument strong enough to reopen the matter, and the printer has not spoken on the subject since.
[ THE PART WE CAN CONFIRM ]
| Shape | Round |
| Diameter | 300mm (verified. twice.) |
| Height | approx. 6mm |
| Colour | Black |
| Finish | Smooth (PLA) or Textured (PETG) — select above |
| Process | FDM 3D printed |
| Brand | Open Basing System (OBS) |
That is the product. We looked for the rest of it. There is no rest of it.
V. THE SCHISM
Then came the question that ended working relationships: does land have corners? We are the department that says no. Land is a horizon. You do not walk to the edge of a field and drop off it — the ground curves gently away, as all serious ground does. We measured to the rim to be certain. There is no rim. We consider this closed.
Our former colleagues disagree. They hold that ground has edges, and that those edges should be paved. We no longer name them. Their version of this base is filed under 300mm Square. You may read it. We would prefer you didn’t. We are not, however, your supervisor.
VI. ATTEMPTS TO ESTABLISH PURPOSE
Once the object existed, the question of what it was for became urgent, having gone unasked at every prior stage. A working group was formed. Its findings, reproduced here without comment, were as follows:
| 01 | COLOSSAL MODEL. A base for the models nothing else will hold — the Titan, the large dragon, the scratch-built kitbash on its fourth base. |
| 02 | COMPLETE DIORAMA. An entire scene across one unbroken circle — a siege, a landing, a last stand that outgrew its table. |
| 03 | ENTIRE ARMY. Per a single report we have chosen not to verify, an army may be based upon it as one continuous piece. When your army is the unit. |
Forty models. One base. One activation. No rulebook covers this scenario. Ours included. We checked ours specifically, then dissolved the working group before it could reach any further conclusions.
VII. THE MATTER OF THE BOX
Shipping was raised late, as everything here was. The object does not fit in the box. It does not fit in any box we own. It ships flat, which is the single reasonable decision it makes, and it arrives as a circle of ground with no packaging large enough to have dignity. It won’t fit in the box. That’s the point. They told us it couldn’t be done. They were correct. We did it anyway.
[ CHOOSE YOUR FINISH ]
|
SMOOTH printed in PLA |
A clean, flat top. Nothing between the surface and your paint. |
|
TEXTURED printed in PETG |
A fine, subtle surface texture — felt more than seen — that takes basing materials and washes beautifully. |
[ WHAT’S IN THE BOX ]
1 × 300mm round base, in your chosen finish. That is the entire contents. There is, as established, nothing else.
[ THE RECKONING ]
testimonials, unverified
“I based my entire Ork army as one unit. My opponent conceded on sight.”
— Dave, allegedly
“It arrived. I wept. It did not fit on my shelf. I built a new shelf.”
— a customer, probably
“★☆☆☆☆ Too powerful. My other bases now feel inadequate.”
“★★★★★ Finally, somewhere to land the Warlord. It fits. Barely. As promised.”
— a Titan owner
“Started a diorama on it in March. I live here now.”
— send help
“My local store asked what it’s for. I said ‘everything.’ They stopped asking.”
— a satisfied customer
[ THERE IS ANOTHER ONE ]
A rival department believes ground has corners. They made a square. We do not speak to them. Their account is filed under OBS 300mm Square Base — search it in our shop, if you must. Pick a side.
[ DISPATCH ]
🚚 Same-day dispatch on orders placed before 3 PM.
📦 Tracked service. Ships flat, from Derby, UK.
✅ 30-day returns. It is a large base; we understand if you need a moment.
HOBBY HEAVEN
By Hobbyists. For Hobbyists.
Part of the Open Basing System — an open, modular basing ecosystem.
Bases, converters, movement trays and hero bases, all designed to work together.
THIS. IS. THREE HUNDRED.
Notes · Q & A
Can I add magnets underneath OBS bases?
Check the selected option's underside opening and available underside depth in Technical Specifications before choosing magnets. Magnet fit depends on the actual cavity dimensions and the magnet you plan to use, so it should not be assumed to be the same across every base.
How do I choose the right base size?
Start with the base footprint required for your model or game, then confirm the selected option against the Technical Specifications. If you are replacing an existing base, measure it carefully and compare its physical footprint before ordering.
How should I use the technical drawing?
Choose your option first, then use the technical drawing and Technical Specifications to check the physical dimensions of the product. When matching an existing part or accessory, use the drawing rather than relying on the product name alone.
Can I rely on the nominal size alone?
No. Products with similar nominal sizes can have different physical dimensions or fit differently across brands and systems. Check the technical drawing, specifications and any product-specific compatibility note before ordering.
Notes · Logistics
Shipping
Returns
Table · Specification
Technical specifications
Product
300mm Round Plastic Base
Code (proj)
BAS/RO/300/PL
Ship. weight
300 g
Brand
Hobby Heaven
Hobby Heaven · Open Basing System
Sheet 2 / 4
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